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Justin Theroux rocks out with John Varvatos (sans Aniston)

Justin Theroux surfaced in Los Angeles on Sunday, but not with his gal Jennifer Aniston: The actor and screenwriter made it a guy's day with designer John Varvatos.

Varvatos hosted the annual Stuart House benefit at his flagship store at Melrose Avenue and Robertson Boulevard, shutting down the chic intersection for a major silent auction and Hollywood family fest.

Leslie Mann and Judd Apatow served as honorary chairs this year, with a slew of famous folks coming out to catch a performance from Dave Matthews.

Hopping a plane from Seattle, Matthews got everyone a little starstruck, including Zoe Saldana, who swayed to his acoustic set along with Joe Manganiello, Rachel Zoe and husband Rodger Berman, Bryan Cranston, Nina Dobrev, Tom Felton and James Van Der Beek.

"I've been working on a new record, so I haven't sung some of these songs in a while," Matthews told the crowd of his earlier hits including "Crush."

"So if I mess up any of the words, it's because I'm an artist," he joked.

Stuart House teamed with Chrysler this year to raise funds for its program, an L.A.-based facility with resources and treatment for child sex-abuse victims.

[For the record, 5:30 p.m. March 12: This post originally gave the title of the song "Crush" incorrectly as "Crazy."]